If your 29g is the standard 30" tank I would highly recommend a 30" Finnex Fugeray.
I just received this fixture in the mail today and just put it on my tank. I Love it!!!
It replaces the 2 Aqueon/Coralife 30" T5NO fixtures that I was using.
Total +1. It will give you about 30 par, perfect for a low tech tank as well as giving you light that will be sufficient for lots of other plants. A single t8 is insufficient if you really want a lush low tech tank IMO